Palm Treo 755P User Manual page 276

Changing Default Applications
Sometimes one application looks for another application to handle information (for
example, a mail application might open a browser when you select a link in an email
message). Your device comes with a set of predefined applications to handle email,
messaging, and browser requests from other applications. If you have more than one
application to handle these requests on your device, you can specify which application you
want to use for each function.
1. Press Applications
2. Select Default apps.
3. Select each pick list, and then select the application you want
to associate with that function.
4. Select Done.
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and select Prefs .
Section 6B: Customizing